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      <a href="/2018/12/23/wxapp-computed/" title="小程序的奇技淫巧之 computed 计算属性" itemprop="url">小程序的奇技淫巧之 computed 计算属性</a>
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      <a href="https://godbasin.github.io" title="被删">被删</a>
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    <time datetime="2018-12-23T09:11:39.000Z" itemprop="datePublished">2018-12-23</time>
    更新日期:<time datetime="2018-12-23T09:11:54.451Z" itemprop="dateModified">2018-12-23</time>
    
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			<strong class="toc-title">文章目录</strong>
		<ol class="toc"><li class="toc-item toc-level-2"><a class="toc-link" href="#自定义组件"><span class="toc-number">1.</span> <span class="toc-text">自定义组件</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#behaviors"><span class="toc-number">1.1.</span> <span class="toc-text">behaviors</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#computed-实现"><span class="toc-number">1.2.</span> <span class="toc-text">computed 实现</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#Page-的超集"><span class="toc-number">2.</span> <span class="toc-text">Page 的超集</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#hack-实现-Page-computed-能力"><span class="toc-number">2.1.</span> <span class="toc-text">hack 实现 Page computed 能力</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#使用-Component-构造器构造页面"><span class="toc-number">2.2.</span> <span class="toc-text">使用 Component 构造器构造页面</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#参考"><span class="toc-number">2.3.</span> <span class="toc-text">参考</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#结束语"><span class="toc-number">3.</span> <span class="toc-text">结束语</span></a></li></ol>
		</div>
		
		<p>小程序的出身，基于安全和管控的考虑，使用了双线程的设计，同时对于 DOM 操作、动态创建 DOM 这些都隔离了。在写代码的时候，模版语法不支持函数计算等，computed 的方法就显得十分重要了。<br><a id="more"></a></p>
<h2 id="自定义组件"><a href="#自定义组件" class="headerlink" title="自定义组件"></a>自定义组件</h2><hr>
<p>小程序的自定义组件涉及功能很多，这篇只针对<code>computed</code>展开来讲。</p>
<p><code>computed</code>比较适合较复杂逻辑的计算，同时在小程序无法在模板里使用<code>methods</code>这样的场景下，计算属性的需求就更强烈了。</p>
<h3 id="behaviors"><a href="#behaviors" class="headerlink" title="behaviors"></a>behaviors</h3><p>自定义组件中，提供了<a href="https://developers.weixin.qq.com/miniprogram/dev/framework/custom-component/behaviors.html" target="_blank" rel="external"><code>behaviors</code>的使用和定义</a>。</p>
<p>从官方文档我们能看到：</p>
<blockquote>
<p><code>behaviors</code>是用于组件间代码共享的特性，类似于一些编程语言中的“mixins”或“traits”。<br>每个<code>behavior</code>可以包含一组属性、数据、生命周期函数和方法，组件引用它时，它的属性、数据和方法会被合并到组件中，生命周期函数也会在对应时机被调用。每个组件可以引用多个<code>behavior</code>。</p>
</blockquote>
<p>简单来说，我们能通过<code>behaviors</code>来重构<code>Component</code>的能力。</p>
<p>如果说，我们能“混入”<code>Component</code>，其实基本很多能力都能实现啦。其实我们自己封装一层的<code>MyComponent</code>也能达到一定的效果，但是这样的拓展性会变得很糟。</p>
<p>通过<code>behaviors</code>的方式，每个组件可以按需引入自己需要的<code>behavior</code>啦。</p>
<h3 id="computed-实现"><a href="#computed-实现" class="headerlink" title="computed 实现"></a>computed 实现</h3><p>我们来梳理下这里的逻辑，我们需要一个<code>computed</code>能力，需要处理的主要是：<code>setData</code>的时候，根据<code>computed</code>来计算哪些数据需要处理。</p>
<p>所以我们要做的是：</p>
<ol>
<li>记下来需要<code>computed</code>的变量。</li>
<li>在每次<code>setData</code>之前，看看是否包含到需要<code>computed</code>的变量，匹配到了就进行<code>computed</code>处理。</li>
<li>使用处理后的数据，进行<code>setData</code>。</li>
</ol>
<p>官方已经提供了<a href="https://github.com/wechat-miniprogram/computed" target="_blank" rel="external">计算属性实现的behavior</a>，大家也可以尽情翻看实现的<a href="https://github.com/wechat-miniprogram/computed/blob/master/src/index.js" target="_blank" rel="external">源码</a>，和使用这种拓展能力。</p>
<h2 id="Page-的超集"><a href="#Page-的超集" class="headerlink" title="Page 的超集"></a>Page 的超集</h2><hr>
<h3 id="hack-实现-Page-computed-能力"><a href="#hack-实现-Page-computed-能力" class="headerlink" title="hack 实现 Page computed 能力"></a>hack 实现 Page computed 能力</h3><p>想必大家都会有疑惑，<code>Component</code>里支持<code>behaviors</code>，但是<code>Page</code>依然写起来很不方便呀。虽然所有的<code>Page</code>最终也能通过<code>Component</code>来实现，但是这样是否需要多包装一层呢？</p>
<p>答案是不用。</p>
<h3 id="使用-Component-构造器构造页面"><a href="#使用-Component-构造器构造页面" class="headerlink" title="使用 Component 构造器构造页面"></a>使用 Component 构造器构造页面</h3><p><code>Component</code>是<code>Page</code>的超集，因此可以使用<code>Component</code>构造器构造页面。</p>
<p>同样的，我们来看看<a href="https://developers.weixin.qq.com/miniprogram/dev/framework/custom-component/component.html" target="_blank" rel="external">官方文档</a>：</p>
<blockquote>
<p>事实上，小程序的页面也可以视为自定义组件。因而，页面也可以使用<code>Component</code>构造器构造，拥有与普通组件一样的定义段与实例方法。但此时要求对应<code>json</code>文件中包含<code>usingComponents</code>定义段。</p>
</blockquote>
<p>也就是说，我们这样的页面：</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div></pre></td><td class="code"><pre><div class="line">Page(&#123;</div><div class="line">  <span class="attr">data</span>: &#123;</div><div class="line">    <span class="attr">logs</span>: []</div><div class="line">  &#125;,</div><div class="line">  onLoad(query) &#123;</div><div class="line">    <span class="comment">// 如访问页面`/pages/index/index?paramA=123&amp;paramB=xyz`，如果声明有属性(`properties`)`paramA`或`paramB`，则它们会被赋值为`123`或`xyz`</span></div><div class="line">    query.paramA <span class="comment">// 页面参数 paramA 的值</span></div><div class="line">    query.paramA <span class="comment">// 页面参数 paramB 的值</span></div><div class="line">    <span class="keyword">this</span>.setData(&#123;</div><div class="line">      <span class="attr">logs</span>: <span class="function">(<span class="params">wx.getStorageSync(<span class="string">"logs"</span></span>) || []).<span class="params">map</span>(<span class="params">(log: number</span>) =&gt;</span> &#123;</div><div class="line">        <span class="keyword">return</span> formatTime(<span class="keyword">new</span> <span class="built_in">Date</span>(log));</div><div class="line">      &#125;)</div><div class="line">    &#125;);</div><div class="line">  &#125;</div><div class="line">&#125;);</div></pre></td></tr></table></figure>
<p>可以这么写：</p>
<figure class="highlight json"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div></pre></td><td class="code"><pre><div class="line">&#123;</div><div class="line">  <span class="attr">"usingComponents"</span>: &#123;&#125;</div><div class="line">&#125;</div></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div></pre></td><td class="code"><pre><div class="line">Component(&#123;</div><div class="line">  <span class="comment">// 组件的属性可以用于接收页面的参数</span></div><div class="line">  properties: &#123;</div><div class="line">    <span class="attr">paramA</span>: <span class="built_in">Number</span>,</div><div class="line">    <span class="attr">paramB</span>: <span class="built_in">String</span>,</div><div class="line">  &#125;,</div><div class="line">  <span class="attr">data</span>: &#123;</div><div class="line">    <span class="attr">logs</span>: []</div><div class="line">  &#125;,</div><div class="line">  <span class="attr">methods</span>: &#123;</div><div class="line">    onLoad() &#123;</div><div class="line">      <span class="comment">// 如访问页面`/pages/index/index?paramA=123&amp;paramB=xyz`，如果声明有属性(`properties`)`paramA`或`paramB`，则它们会被赋值为`123`或`xyz`</span></div><div class="line">      <span class="keyword">this</span>.data.paramA <span class="comment">// 页面参数 paramA 的值</span></div><div class="line">      <span class="keyword">this</span>.data.paramB <span class="comment">// 页面参数 paramB 的值</span></div><div class="line">      <span class="keyword">this</span>.setData(&#123;</div><div class="line">        <span class="attr">logs</span>: <span class="function">(<span class="params">wx.getStorageSync(<span class="string">"logs"</span></span>) || []).<span class="params">map</span>(<span class="params">(log: number</span>) =&gt;</span> &#123;</div><div class="line">          <span class="keyword">return</span> formatTime(<span class="keyword">new</span> <span class="built_in">Date</span>(log));</div><div class="line">        &#125;)</div><div class="line">      &#125;);</div><div class="line">    &#125;</div><div class="line">  &#125;</div><div class="line">&#125;);</div></pre></td></tr></table></figure>
<p>这样，我们就能愉快地使用<code>behaviors</code>啦。</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">const</span> computedBehavior = <span class="built_in">require</span>(<span class="string">"miniprogram-computed"</span>);</div><div class="line">Component(&#123;</div><div class="line">  <span class="attr">behaviors</span>: [computedBehavior],</div><div class="line">  <span class="attr">data</span>: &#123;</div><div class="line">    <span class="attr">logs</span>: []</div><div class="line">  &#125;,</div><div class="line">  <span class="attr">computed</span>: &#123;</div><div class="line">    logsAfterComputed() &#123;</div><div class="line">      <span class="comment">// 计算属性同样挂在 data 上，每当进行 setData 的时候会重新计算</span></div><div class="line">      <span class="comment">// 比如此字段可以通过 this.data.b 获取到</span></div><div class="line">      <span class="keyword">return</span> <span class="keyword">this</span>.data.logs.map(<span class="function"><span class="params">x</span> =&gt;</span> &#123;</div><div class="line">        <span class="keyword">return</span> &#123;</div><div class="line">          <span class="attr">log</span>: x,</div><div class="line">          <span class="attr">logAfterCompute</span>: x + <span class="string">"logAfterCompute"</span></div><div class="line">        &#125;;</div><div class="line">      &#125;);</div><div class="line">    &#125;</div><div class="line">  &#125;,</div><div class="line">  <span class="attr">methods</span>: &#123;</div><div class="line">    onLoad() &#123;</div><div class="line">      <span class="keyword">this</span>.setData(&#123;</div><div class="line">        <span class="attr">logs</span>: <span class="function">(<span class="params">wx.getStorageSync(<span class="string">"logs"</span></span>) || []).<span class="params">map</span>(<span class="params">(log: number</span>) =&gt;</span> &#123;</div><div class="line">          <span class="keyword">return</span> formatTime(<span class="keyword">new</span> <span class="built_in">Date</span>(log));</div><div class="line">        &#125;)</div><div class="line">      &#125;);</div><div class="line">    &#125;</div><div class="line">  &#125;</div><div class="line">&#125;);</div></pre></td></tr></table></figure>
<p>使用<code>Component</code>构造器构造页面，需要注意：</p>
<ol>
<li>组件的属性可以用于接收页面的参数，如访问页面<code>/pages/index/index?paramA=123&amp;paramB=xyz</code>，如果声明有属性(<code>properties</code>)<code>paramA</code>或<code>paramB</code>，则它们会被赋值为<code>123</code>或<code>xyz</code>。（可参考<a href="https://developers.weixin.qq.com/miniprogram/dev/framework/custom-component/component.html" target="_blank" rel="external">官方代码示例</a>）</li>
<li>页面的生命周期方法（即<code>on</code>开头的方法，如上面的<code>onLoad</code>），应写在<code>methods</code>定义段中。</li>
</ol>
<p>这样，你就能愉快地在代码里面使用<code>computed</code>计算属性啦~</p>
<p>更多的，也可以参考本人的<a href="https://github.com/godbasin/wxapp-typescript-demo" target="_blank" rel="external">wxapp-typescript-demo</a>中的<a href="https://github.com/godbasin/wxapp-typescript-demo/tree/master/src/pages/logs" target="_blank" rel="external">log page</a>，后续也会持续更新方便好用的能力 demo。</p>
<h3 id="参考"><a href="#参考" class="headerlink" title="参考"></a>参考</h3><ul>
<li><a href="https://developers.weixin.qq.com/miniprogram/dev/framework/custom-component/component.html" target="_blank" rel="external">Component构造器</a></li>
<li><a href="https://developers.weixin.qq.com/miniprogram/dev/framework/custom-component/behaviors.html" target="_blank" rel="external">behaviors</a></li>
</ul>
<h2 id="结束语"><a href="#结束语" class="headerlink" title="结束语"></a>结束语</h2><hr>
<p>小程序提供的能力其实挺多的，但是很多时候由于文档很多、查找不方便，会导致我们有些很好用的功能没有发现，然后苦逼地一边吐槽一边悲壮地撸代码。<br>官方提供的目前只有<code>computed</code>，大家可以看看，是不是还可以做<code>watch</code>之类的能力呢？</p>
  
		
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